Maine · HVAC licensing · official-source guide
The Maine Fuel Board, part of the Office of Professional and Occupational Regulation, licenses the heating side of HVAC work: oil, solid fuel, propane and natural gas burner installation and service, at Apprentice, Journeyman and Master levels. Maine has no separate state license for pure electric air conditioning or ventilation work. Anyone who handles refrigerant must also hold federal EPA Section 608 certification.
Verified against agency sources on 2026-09-12. Rules and fees change; confirm with the named authority before relying on this guide.
Maine does not have one board that licenses all of heating, ventilation, air conditioning and refrigeration work under a single HVAC card. The state licenses the fuel-burning half of that work through the Maine Fuel Board, a board inside the Office of Professional and Occupational Regulation within the Department of Professional and Financial Regulation. The board's purpose, set out on its own homepage, is to examine and license applicants who install or service oil burner, solid fuel, propane and natural gas heating equipment, and to enforce safety standards for that equipment. State law backs this up directly: a person who installs or services solid fuel burning equipment, including pellet-fired central heating appliances, or oil, propane or natural gas burning equipment, or a facility where propane or natural gas is dispensed, must be licensed under Title 32, chapter 139, unless a specific exception applies. There is no equivalent state board for pure air conditioning, ventilation or refrigeration work that does not involve a fuel-burning appliance. A contractor doing central air conditioning changeouts, ductwork, ventilation, or electric heat pump work may never touch a Maine Fuel Board license at all, and instead falls under the Electricians' Examining Board for the electrical connections, or under no state trade license if the work is purely mechanical duct and equipment work with no fuel-burning or electrical component. This page treats the Maine Fuel Board as the relevant authority because it is the license almost every heating contractor working in Maine will need, and because it is the closest thing Maine has to a state HVAC license.
The Maine Fuel Board issues several distinct licenses rather than one general HVAC card. On the oil and solid fuel side, there are three tiers: Apprentice Oil Burner and/or Solid Fuel Technician, Journeyman Oil Burner and/or Solid Fuel Technician, and Master Oil Burner and/or Solid Fuel Technician. Each tier can carry separate authorities for 1 and 2 fuel oils up to 15 gallons per hour, 1 and 2 fuel oils over 15 gallons per hour, 4, 5 and 6 fuel oils, and solid fuel. On the gas side, a Propane and Natural Gas Technician license can carry one or more authorities: Delivery Technician, Plant Operator, Tank Setter and Outside Piping Technician, Appliance Connection and Service Technician up to 500,000 BTUs per appliance, and Large Equipment Connection and Service Technician over 500,000 BTUs per appliance. A Propane and Natural Gas Helper license lets a person assist a licensed technician under direct, continuous, on-site supervision. Separate limited licenses exist for narrower tasks: Limited Tank Installer, for installing outside residential heating oil tanks at manufactured housing; Limited Wood Pellet Technician, restricted to ash pan, burn pot and distribution tube cleaning; Oil Limited Energy Auditor Technician and Propane Limited Energy Auditor Technician, who may test combustion safety and efficiency but may not adjust the equipment; and a one-year Temporary Permit for a Plant Operator or Delivery Technician. Every license and its named authorities are listed on the board's individual licenses page.
Sourcesmaine.gov
The trigger for needing a Maine Fuel Board license is fuel: the statute licenses installation and service of solid fuel, oil, propane and natural gas burning equipment, plus facilities where propane or natural gas is dispensed. Chimneys tied to that equipment fall under the same chapter. The statute also carves out specific exceptions. A duly licensed electrician is exempt for the electrical equipment and electrical work involved in installing an oil, solid fuel, propane or natural gas burner. A person holding certain engineer's licenses, or working under one, is exempt for burner repair and maintenance inside the steam or heating plant where that person works. Solid fuel fireplace stoves, room heaters and cooking stoves not attached to a central heating system are exempt, as is heating or cooling equipment operated by solar energy. A highway transport driver hauling propane in a large tank truck to a bulk plant or industrial customer is exempt, along with an individual user of a self-service propane or natural gas dispensing station. Outside these exceptions, straight air conditioning work, such as installing or servicing a central air conditioner, ductless mini-split, or ventilation system that does not burn fuel, is not listed anywhere in this chapter's license-required language, and the Maine Fuel Board's own license list does not contain an air conditioning or refrigeration category. That work is instead reached through electrical licensing, or is not state-licensed as a trade at all in Maine.
Sourceslegislature.maine.gov 1legislature.maine.gov 2maine.gov 3
Ductless mini-split heat pumps sit at the boundary between the Maine Fuel Board and the Electricians' Examining Board, and the two boards resolved the overlap with a written memorandum of understanding. Under that memorandum, a person holding a valid Maine Master or Journeyman Oil Technician license may install the electrical conductors, branch circuit, fittings, devices and raceways needed to power and control a mini-split air source heat pump, and may install, replace or adjust the motor or control on the dedicated heating branch circuit as the National Electrical Code requires. The technician may also install the branch circuit overcurrent device if panel space and capacity allow, and the associated low voltage wiring if it is fed from the heating branch circuit. The memorandum does not cover wiring the outdoor service receptacle unless that receptacle is built into the required disconnect switch, and it does not cover mini-split units above 36,000 BTU of heating or cooling capacity. All electrical work still has to meet the National Electrical Code, NFPA 70, as the Electricians' Examining Board has adopted it, and all required permits still apply. Two other memoranda cover the same kind of boundary for hot water, steam and warm air heating systems and water heaters, one with the Electricians' Examining Board and one with the Plumbers' Examining Board. A contractor who installs heat pumps in Maine without an oil technician license, and without an electrician's license, is not covered by any of these arrangements.
Sourcesmaine.gov 1maine.gov 2
Apprentice Oil Burner and/or Solid Fuel Technician has no experience prerequisite; the applicant submits a completed application and works under a licensed master's direct supervision from there. Moving up to Journeyman Oil Burner and/or Solid Fuel Technician requires one of three paths: at least one year of experience as a licensed apprentice, or a board-approved course of at least 160 hours with at least 75 hours of laboratory work plus six months of licensed apprentice experience, or a one-year accredited heating course at a Maine community college of at least 320 hours with at least 150 hours of laboratory work. Master Oil Burner Technician requires at least four years of licensed experience, at least two of which were as a licensed Journeyman. Master Solid Fuel Technician requires at least two years of licensed experience as an Apprentice Solid Fuel Technician, though a licensed Master Oil Burner Technician can sit for the Master Solid Fuel exam without separate solid fuel field experience. On the gas side, a Propane and Natural Gas Technician applicant must complete a board-approved training program, commonly the certified employee training program of a national propane gas association, or a board-approved course at a Maine community college or career and technical education center, before the board will approve the applicant to sit for the required exam. A Propane and Natural Gas Helper needs only a completed application, since a Helper always works under direct, continuous supervision on site.
Sourcesmaine.gov 1maine.gov 2
Apprentice-level licenses in both the oil and solid fuel line and the propane and natural gas line do not require an exam; the Helper license is the same way. Above that, testing is required. Journeyman and Master Oil Burner and/or Solid Fuel Technician applicants must score at least 70 percent to pass, and the exams are split by fuel category: 1 and 2 oils up to 15 gallons per hour, 1 and 2 oils over 15 gallons per hour, 4, 5 and 6 oils, and solid fuel. An applicant needs board approval before scheduling an exam, and can submit an electronic license application 24 hours after passing. Propane and Natural Gas Technician applicants sit for an exam tied to the authority sought, such as Delivery Technician, Plant Operator, Tank Setter and Outside Piping, Appliance Connection and Service, or Large Equipment Connection and Service; the Large Equipment authority also requires already holding the Appliance Connection and Service authority and passing a separate Large Equipment exam. Since January 1, 2020, every propane and natural gas applicant must apply for, receive board approval for, sit for, and pass a Maine Fuel Board propane and gas exam before the board will accept a license application, and an incomplete exam or license application, missing certified employee training program certificates or an official transcript, will be returned rather than processed.
Every Maine Fuel Board license carries a separate license fee plus a $21 criminal background check fee, charged once at initial application. Apprentice Oil Burner and/or Solid Fuel Technician costs $40. Journeyman Oil Burner and/or Solid Fuel Technician costs $100. Master Oil Burner and/or Solid Fuel Technician costs $200. Limited Tank Installer, Limited Wood Pellet Technician, Oil Limited Energy Auditor Technician and Propane Limited Energy Auditor Technician each cost $50. Propane and Natural Gas Helper costs $20. Propane and Natural Gas Technician costs $100, and adding a further authority to an existing Propane and Natural Gas Technician license costs nothing beyond passing the required exam. A one-year Temporary Permit for a Plant Operator or Delivery Technician costs $20 plus the $21 background check fee. Every license runs on a two-year term counted from the first licensure date, except the Temporary Permit, which runs one year, and the biennial renewal fee for each license matches its original license fee. State law caps how high any one of these fees can go: the director of the Office of Professional and Occupational Regulation can set fees by rule, but the fee for any single purpose cannot exceed $350 for a two-year period. Every fee quoted here is below that statutory ceiling.
The Maine Fuel Board's own published requirements for every individual license, initial and renewal alike, list only a license fee, a one-time $21 criminal background check fee, and, for higher tiers, an experience or training record. None of the license pages for Apprentice, Journeyman or Master Oil Burner and/or Solid Fuel Technician, Propane and Natural Gas Technician or Helper, or any of the limited licenses, lists a surety bond or a minimum general liability insurance policy as a condition of getting or keeping the license. The statute creating the board's licensing authority likewise limits an applicant's obligation to a properly completed application plus the required fee; it does not add a bonding or insurance condition. This does not mean an HVAC contractor in Maine can skip insurance altogether. A business with employees still has to meet Maine's general workers' compensation insurance law, administered by the Maine Workers' Compensation Board, regardless of trade or license type, and most customers and general contractors will still expect proof of general liability coverage before hiring a subcontractor. But that comes from being an employer and a contractor generally, not from a Maine Fuel Board bonding or insurance rule specific to oil, solid fuel, propane or natural gas technicians, because no such trade-specific rule appears in the board's published licensing requirements.
Every Maine Fuel Board license renews every two years, on a cycle set from the license's first issue date, and the standard renewal fee matches the original license fee: $40 for Apprentice, $100 for Journeyman, $200 for Master, $50 for each limited license, $20 for a Helper, and $100 for a Propane and Natural Gas Technician. A late fee of $50 applies to a license renewed after its expiration date, generally within 90 days of expiring. For Journeyman, Master and Propane and Natural Gas Technician licenses, a renewal filed more than 90 days but not more than two years after expiration can still be reinstated by paying the original license fee again plus a $100 penalty fee. Past two years late, the board treats the applicant as a brand new applicant, subject to every original qualification again. None of the board's published renewal requirements list a continuing education hour requirement for any Maine Fuel Board license; renewal turns on paying the fee on time and, where applicable, filing before the two-year reinstatement cutoff, not on documented training hours. That is a real difference from several other states, where oil, gas or HVAC technicians must log annual continuing education hours to keep a license active, and it means a licensed Maine technician who never takes another class still keeps the license current by renewing and paying on time.
Sourcesmaine.gov
Maine law directs the Maine Fuel Board to build a licensure-by-endorsement pathway, running alongside its ordinary licensing process, for each license type the board decides is appropriate for that treatment. That pathway operates under the state's general endorsement statute for professional licensing boards, and an applicant can choose to apply either through the endorsement process or through the board's other licensing routes. The statute itself does not spell out which specific credentials from which other states the Maine Fuel Board accepts, or list a reciprocal-state table; that detail sits in the board's rules and application forms rather than in the enabling statute. What the statute does establish is that Maine will not force every out-of-state applicant through the full apprentice-to-master pathway described elsewhere on this page if the board finds an applicant's existing license or credential appropriate for endorsement. An oil burner, solid fuel, or propane and natural gas technician moving to Maine from another state should contact the Maine Fuel Board directly, or check its application forms, to confirm whether a specific out-of-state license currently qualifies for endorsement before assuming either full reciprocity or a full retest is required.
Sourceslegislature.maine.gov
Maine treats unlicensed fuel-burning equipment work as a criminal matter, not just a civil fine. A person, firm or corporation that makes an oil, solid fuel, propane or natural gas installation without the license Title 32, chapter 139 requires, or that employs an unlicensed person to make such installations, is subject to Title 10, section 8003-C, Maine's general unlicensed-practice statute for boards under the Office of Professional and Occupational Regulation. Under that statute, a person who practices, or represents to the public that they are authorized to practice, a licensed trade while intentionally, knowingly or recklessly failing to hold the required license, or after that license has expired, been suspended, or been revoked, commits a Class E crime. A second such violation, if the earlier conviction fell within the prior three years, commits a Class D crime. Maine's criminal code sets the maximum fine a court can impose on an individual for a Class E crime at $1,000, and for a Class D crime at $2,000, unless another statute sets a different maximum. Violating the Maine Fuel Board's licensing statute is also a strict liability crime, meaning the state does not have to prove the person intended to break the law, only that the unlicensed installation happened. Separately, a chimney or fireplace installer who takes payment for the work but fails to give the required NFPA 211 disclosure statement before installing commits a civil violation carrying a fine of not less than $500.
Sourceslegislature.maine.gov 1legislature.maine.gov 2legislature.maine.gov 3legislature.maine.gov 4
Maine law takes the licensing decision for oil, solid fuel, propane and natural gas technicians out of every city's hands. A municipality, no matter what its own charter says, may not require an oil and solid fuel burning technician or a propane and natural gas technician to hold a separate municipal license. That rule applies the same way in Portland, Maine's largest city, in Lewiston, and in Bangor, as it does in every other Maine municipality. What a municipality can still do is require a permit before the installation work happens, and the statute conditions that permit on state compliance: a municipality may not issue a permit for an oil, solid fuel, propane or natural gas burning installation unless it is satisfied that the permit applicant meets Title 32, chapter 139's requirements, which in practice means holding the correct Maine Fuel Board license. So a heating contractor working in Portland, Lewiston or Bangor still has to pull a local building or mechanical permit for most fuel-burning installations, and the local code office will check the contractor's Maine Fuel Board license number as part of approving that permit, but the contractor never needs, and cannot be made to get, a city-issued HVAC or fuel technician license on top of the state one. This is a case where the state license fully answers the city-level question for this trade, rather than adding a separate local licensing layer the way some other states do.
Sourceslegislature.maine.gov
Title 32, chapter 139 does not contain a rule requiring an oil, solid fuel, propane or natural gas technician to print a license number on trucks, advertisements, a website, or a written estimate, and the Maine Fuel Board's published rule chapters, covering definitions, categories of licensure, examination and licensure qualifications, and installation standards for each fuel type, do not add a separate advertising or license-display chapter either. What the chapter does regulate is the act of claiming to be licensed. Under Title 10, section 8003-C, a person who represents to the public that they are authorized to practice a licensed trade while failing to hold the required license, or after that license has expired, been suspended, or been revoked, commits a Class E crime, rising to a Class D crime on a repeat violation within three years. In practice, that means a technician may only advertise as a licensed Apprentice, Journeyman or Master Oil Burner and/or Solid Fuel Technician, a Propane and Natural Gas Technician, or a Propane and Natural Gas Helper, if that specific license is currently active, and advertising an expired or suspended license as current is itself the violation the statute targets. The one specific disclosure duty the chapter does impose falls on chimney and fireplace installers, who must give a customer a board-approved written disclosure statement confirming NFPA 211 compliance before the installation happens, with a civil fine of not less than $500 for skipping it.
Sourceslegislature.maine.gov 1legislature.maine.gov 2legislature.maine.gov 3maine.gov 4
None of the Maine Fuel Board licenses cover handling refrigerant, because the board's jurisdiction runs to fuel-burning heating equipment, not to the refrigerant circuits inside air conditioners, heat pumps, and refrigeration equipment. That gap is filled by federal law instead of state law. Under Section 608 of the Clean Air Act and its implementing regulations at 40 CFR Part 82, Subpart F, the U.S. Environmental Protection Agency requires certification for any technician who maintains, services, repairs, or disposes of equipment that could release refrigerant into the atmosphere. The EPA defines a technician for this purpose as anyone who attaches or detaches hoses and gauges to measure pressure in an appliance, adds or removes refrigerant, or otherwise violates the integrity of a motor vehicle air conditioner-like appliance or a small appliance, other than for disposal. An apprentice is exempt from the certification requirement only while closely and continually supervised by a certified technician. The EPA issues four certification types: Type I for small appliances, Type II for high- or very high-pressure appliances other than small appliances and motor vehicle air conditioners, Type III for low-pressure appliances, and Universal for all equipment types, which requires passing a proctored core exam rather than an open-book one. A technician must pass an EPA-approved test given by an EPA-approved certifying organization, and once earned, Section 608 credentials do not expire. This federal certification stacks on top of, and is separate from, any Maine Fuel Board license: a contractor working on a heat pump's refrigerant circuit in Maine needs Section 608 certification regardless of what state license, if any, covers the rest of the job.
Sourcesepa.gov
Maine runs a single public license lookup system, called ALMS License Information, for every board and program inside the Department of Professional and Financial Regulation, including the Maine Fuel Board. A customer can search by individual name, choose the Professional and Financial Regulation department, and narrow the search to the Maine Fuel Board as the regulator, or search company licenses the same way, to confirm whether a technician or business currently holds an active license, and to see what authorities that license carries. The board's own frequently asked questions confirm that, apart from an applicant's Social Security number, license application information is public and that contact information submitted to the board gets posted on the board's website, which is consistent with the ALMS system being the public-facing verification tool for this trade. Because state law bars municipalities from licensing oil, solid fuel, propane and natural gas technicians on their own, ALMS is also the only license record that matters for this trade; there is no separate city license number to check in Portland, Lewiston, Bangor, or anywhere else in Maine. A customer who wants to confirm a heating contractor's credentials before signing a contract can search that contractor's name in ALMS, confirm the license is active and not expired, suspended or revoked, and see which specific fuel types and authorities, such as oil up to 15 gallons per hour or propane appliance connection, the license actually covers.
A Maine Fuel Board license covers the technical side of installing and servicing fuel-burning heating equipment, but it is not the only requirement for running an HVAC contracting business in the state. Maine has no general contractor or home improvement contractor license at the state level; the full list of professions the Office of Professional and Occupational Regulation licenses does not include a general contractor category, only trade-specific boards such as the Maine Fuel Board, the Electricians' Examining Board, the Plumbers' Examining Board, and the Elevator Contractor license. That means a heating contractor's baseline legal obligation to operate at all rests on the trade licenses that actually apply to the work being done, not on a separate business-level contractor license. Beyond the trade license, an employer in Maine, in any trade, has to carry workers' compensation insurance for its employees under rules the Maine Workers' Compensation Board administers and enforces, and the board's insurance coverage unit handles verification and independent contractor status questions for employers who are unsure whether a given worker counts as an employee for coverage purposes. A contractor organized as a corporation or LLC also has to register that entity with the Maine Secretary of State, separate from any trade licensing step. None of these general business obligations are unique to HVAC work, but they apply on top of, not instead of, whatever Maine Fuel Board or electrician's license the work itself requires.
Sourcesmaine.gov 1maine.gov 2
These are common details other guides publish about Maine, but we could not verify them from the agency source. Confirm them directly before relying on them.
Not under that name. The Maine Fuel Board licenses the fuel-burning side of heating, meaning oil, solid fuel, propane and natural gas burner installation and service, at Apprentice, Journeyman and Master levels. There is no single state license that also covers pure electric air conditioning, ventilation, or refrigeration work.
The Maine Fuel Board, a board inside the Office of Professional and Occupational Regulation within the Department of Professional and Financial Regulation. It examines and licenses oil burner, solid fuel, propane and natural gas technicians statewide.
If the job is purely mechanical, such as ductwork and equipment that does not burn fuel, chapter 139's license-required language does not reach it and the Maine Fuel Board has no air conditioning license category. Electrical connections on the unit still fall under the Electricians' Examining Board.
Apprentice needs no exam and works under a Master's direct supervision. Journeyman requires either one year as an apprentice, or a 160-hour board-approved course plus six months as an apprentice, or a 320-hour community college heating course, then a passing exam score of 70 percent. Master requires four years of licensed experience, two of them as a Journeyman, plus a passing exam.
License fees range from $20 for a Propane and Natural Gas Helper to $200 for a Master Oil Burner and/or Solid Fuel Technician, plus a one-time $21 criminal background check fee. Renewal every two years matches the original license fee, and state law caps any single license fee at $350 for two years.
No. The Maine Fuel Board's published license and renewal requirements list only the fee, the background check, and, for higher tiers, documented experience or training. None of them add a surety bond or a minimum insurance policy as a licensing condition.
The board's published renewal requirements do not list continuing education hours for any Maine Fuel Board license. Renewal turns on paying the biennial fee on time, not on logged training hours.
Unlicensed fuel-burning installation work is a crime, not just a civil matter. A first violation is a Class E crime, carrying a maximum fine of $1,000; a repeat violation within three years is a Class D crime, carrying a maximum fine of $2,000.
No. State law bars any Maine municipality from requiring an oil and solid fuel burning technician or a propane and natural gas technician to hold a separate municipal license. Cities can still require a permit before installation, conditioned on the contractor already holding the correct state license.
Search the contractor's name in the state's ALMS License Information system and filter to the Maine Fuel Board as the regulator. The search shows whether the license is currently active and which specific fuel types and authorities it covers.
Yes, if the work involves refrigerant. Anyone who maintains, services, repairs or disposes of equipment that could release refrigerant needs EPA Section 608 certification under the Clean Air Act, separate from and in addition to any Maine Fuel Board license.
Maine law directs the Maine Fuel Board to offer a licensure-by-endorsement path for license types the board finds appropriate for it, running alongside the standard application and exam process. The statute does not list specific reciprocal states, so an applicant should confirm eligibility directly with the board.
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